Scale-tester.



J. T. BOSWELL.

SCALE TESTER.

APPLICATION FILED 111111.20, 1911.

1,054,168, Patented Feb. 25, 1913.

WITNESSES:

IN VE N TOR.

J77B0SWELL.

BY 2 Z ATTbIiNE Y.

UNITED STATES PATENT OFFICE.

JOHN T. BOSWELL, OF KANSAS CITY,.MISSOURI, ASSIGNOR TO LAURA BOSWELL ANDGRACE BOSWELL, OF KANSAS CITY, MISSOURI.

SCALE-TESTER.

To all who-m 2'25 may concern Be it known that I, JOHN T. BOSWELL, acitizen of the United States, residing at Kansas City, in the county ofJackson and State of Missouri, have invented certain new and usefulImprovements in Scale- Testers; and I do declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to theletters and figures of reference marked thereon, which form a part ofthis specification.

My invention relates to scale testers and has for its object to providea device for ascertaining the accuracy of platform or other scales byproducing a heavy pressure upon the scale platform, without the use ofmany expensive and cumbersome test weights. In accomplishing th1s ob ectI provide a balance beam having a fulcrum bearing on a standard supporton the scale frame, and a fulcrum bearing on a standard support on thescale platform, the beam being provided with a weight which may be usedin the same manner as an ordinary scale weight.

I also provide other improved details of structure which will presentlybe described and claimed and are illustrated in the accompanyingdrawings, in which Figure I is a perspective view of a scale testerconstructed according to my invention. Fig. II is an enlarged detailview of a part of the platform standard and beam hanger. Fig. III is across section through the end of the scale frame, showing the framestandard applied thereto. Fig. IV is an end view of a part of theplatform standard, showing the anchoring teeth. Fig. V is an enlargedperspective view of the upper end of the frame standard, show-- ing theadjustable fulcrum bearing. Fig. VI is a detail View of the connectionbetween the scale beam and its shank, parts being broken away for betterillustration. Fig. VII is a detail view of the fulcrum connectionbetween the beam shank and the frame and platform standard members.

Referring more in detail to the parts :1 designates the frame and 2 theplatform of a wagon scale of ordinary construction. Mounted on the frame1 is a standard 3 having a base 4 provided with a dependingSpecification of Letters Patent.

Application filed March 20, 1911.

Patented Feb. 25, 1913. Serial No. 615,526.

flange 5 that is adapted to bear against the inner edge of the frame andis provided with inturned blades 6 which are adapted to be pressed intothe frame when the latter is constructed of wood, or to receive a metalframe member therebetween.

7 designates the adjusting base member. which is provided with a neck 8,adapted to overlap a part of the base 4 and has a slot-9 through whicha'bolt 9' that is carried by base 4 is adapted to project, so that theparts may be fixed securely together in an adjusted position. At theouter end of member 7 is a depending flange 10, which is adapted to hangover the scale frame and has set screws 11 which are adapted to projecttherethrough and engage the outer face of the frame, so that when theyare tightened the base 4 will be pulled back to press the blades 6 intothe wood, or tighten the entire base on a metal frame.

Rising from base 4 are the spaced standard members 12 having an upperconnecting part 13 integral therewith. On the inner faces of the members12. at the top of the standard, are inturned anges 14 forming the Ways15 for a sliding fulcrum block 16, comprising a flat top member 17 andlegs 18, the latter being provided with upturned notches 19 in theirlower free ends. EX- tending through the top 13 of the frame standard isa set screw 20, which is adapted to bear against the top of the fulcrumblock and provide adjustment therefor, for a purpose presently setforth.

Seated on the platform 2 is a standard 21 comprising the base 22, spacedvertical members 23, and a top shelf 24. Extending through the shelf 24and depending in front of the opening between the spaced members 23, isa hook bolt 25, having a nut 26 bearing against the top of the shelf.

27 designates the shank of a scale beam which is provided, at one end,with trunnion members 28, which are preferably provided with knife edgecontact portions at the top which are adapted to seat in the notches 19in the adjustable fulcrum block on the frame standard. At anintermediate point on the shank are other trunnions 29 having downturnedpoints for providing knife edge contacts with the eye members of aclevis 30, which is adapted to hang on the hook bolt 25 that is carriedby the platform standard. The outer end of the shank 27 is slotted andprovided with a rearwardly inclined face 27.

31 designates the tester beam, which is preferably graduated as anordinary scale beam and has a beveled inner end adapted for projectioninto the slot in the beam shank and engagement with the inclined facethereof, the parts being connected by any suitable means, such as boltsor rivets 32.

33 designates a weight which is preferably flat, as shown, so that itmay be moved. close to the platform standard and is provided with abail-hook 33 having an opening 34., through which the bail 35 may bepassed. The bail 35 is adapted for movement over the tester beam, andadapted to seat over the graduation points thereon, or to rest within anotch 36 near the fulcrum end of the beam.

In testing the device to determine the location of the graduat-ions onthe test beam, the standard 3 is located on the scale frame, near onecorner, and the standard 21 seated on the scale platform adjacent theframe standard; the beam is fulerumed as illustrated in Fig. I and theweight 33 placed in position with the bail in the notch 36. The scalebeam is then balanced and a U. S. standard fifty pound test weight isplaced on the platform and the scale weight moved out on its beam untilsaid beam balances. The test weight is then removed and the weight 33moved out on the beam 31 until the scale beam balances, when agraduation is marked on the beam. Additional fifty pound test weightsare then used in the same manner to secure graduations up toone-thousand pounds or over, if desired.

With the tester correctly constructed and graduated, a scale may betested by setting up the device in the same manner, balancing the scalewith the tester in place and moving the test weight 33 out on its beamto a graduated point, for instance to the onethousand pounds graduation.If the scale beam balances at one-thousand pounds, when test weight ismoved out to the onethousand pounds graduation point on the beam of thetester, the scale is evidently accurate, which may be proved by the factthat twenty, fifty pound test weights and the weight 33 placed at theone-thousand pound graduation point on the tester beam, produce exactlythe same balance on the scale beam.

I have found from experience that the best results are secured with thetester when the beam is substantially horizontal, and in order tomaintain the beam in that position, I provide either or both of thestandards with means for adjusting the beam.

It is apparent that with the beam hung from the hook bolt and bearingupwardly on the fulcrum block of the frame standard, that by turning thescrew 20, the sliding block may be raised or lowered to raise or lowerthe opposite end of the beam and that by allowing the block to remainstationary and turning the nut on the hook bolt, the beam may also beraised or lowered to secure the proper adjustment.

I prefer to make the tests near the corners of the scales and move theparts from one corner to another, so that a test is made near eachcorner of the scale, as the scale bearings are usually placed near thecorner of the platform and testing each bearing with a one-thousandpound pressure, equals a weight of four-thousand pounds distributed overthe scale platform.

While I have shown and described my device as applied to a wagon scale,I do not wish to be understood as limiting it thereto, as scales ofother construction may be tested thereby.

Having thus described my invention, what- I claim new therein and desireto secure by Letters-Patent is 1. A scale tester comprising frame andplatform standards, fulcrum member slidably mounted in the f amestandard, a beam supported from the platform standard and engaging theslidably mounted fulcrum and means on the platform standard foradjusting said beam vertically.

A scale tester col'nprising frame and platform standards, a slidableblock carriedby the frame standard, a set screw extending through thetop of the standard and engaging said block, means on the platformstandard for supporting a beam, and a beam carried by said means andhaving fulcrum members engaging the sliding block, for the purpose setforth.

3. A scale tester comprising frame and platform standards, said framestandard having inturned flanges at the top for forming ways, a blockslidably mounted in said standard and having downturned legs providedwith notches in their under faces, a set screw threaded into the top ofsaid standard and adapted for adjustably engaging the top of the block,means on the platform standard for supporting a beam, and a beam carriedby said means and having fulcrum members seated in the notches in saidblock, for the purpose set forth.

4;. A scale tester comprising frame and platform standards, a beamsupported by said platform-standard engaging the frame standard, andmeans on said standards for independently adjusting the said beam.

5. A scale tester comprising frame and platform standards, a two-piecebeam sup ported by the platform standard and engaging the framestandard, and means on each of said standards for independentlyadjusting the beam.

6. A scale tester comprising frame and platform standards, a scale beamhaving substantially as and for shank and graduated portions supportedby the platform standard and engaging the frame standard, and means onone of the standards for adjusting the beam.

7. A scale tester comprising frame and platform standards, and a scalebeam ful crumed thereon, said frame standard having an adjustable base,and a depending flange on the frame standard having blades for clampingsaid base on a scale frame.

8. A scale tester comprising frame and platform standards, and a beamfulcrumed thereon, said frame standard having a de pending flangeprovided with blades, and a member having a neck adjustably connectedwith the body of the standard base and a depending flange provided witha set screw, the purpose set forth.

9. A scale tester comprising frame and platform standards, said platformstandard being provided with an apertured shelf, a hook bolt having athreaded shank projected through the aperture in said shelf, a nut onthe upper end of said shank, bearing on the top of the shelf andsupporting the bolt therefrom, a clevis hung on said hook bolt, a beamfulcrumed in said clevis and in the frame standard and adapted to behorizontally adjusted by the hook bolt of the plat form standard.

10. A scale tester comprising frame and platform standards, and a scalebeam fulcrumed thereon, said frame standard having a depending bladedflange for the purpose setforth.

11. A scale tester comprising frame and platform standards, and a scalebeam fulcrumed thereon, said frame standard having depending flanges,one of said flanges having a plurality of blades and a set screwdisposed in the other of said flanges, for clamping the frame standardon a scale frame.

12. A scale tester comprising frame and platform standards, a scalebeam, having a slotted shank, adapted for receiving a tester beam, thesaid beams being adjustably supported on said platform standard andhaving fulcrum bearing on the same standards.

13. A scale tester comprising frame and platform standards, a scale beamhaving shank and graduated portions and adjustably supported on saidplatform standard, and having adjustable engagement with the framestandard.

14. A scale tester comprising frame and platform standards having base,vertical and top port-ions, said platform standard having a dependingadjustable member in its top portion, adapted for supporting a beam, anda beam carried by said member, said frame standard having a blockslidably mounted on its vertical portions and provided with downturnedlegs, and a set screw threaded into the top of said standard and adaptedfor moving the block legs into engagement wit-h the said beam.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN T. BOSWELL.

\Vitnesses MYRTLE M. J ACKSON, ARTHUR V. Cors.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

